R. H. Becker

187 public-domain plates in the archive

• Peromyscus maniculatus sonoriensis 15 May 1916
• Thomomys townsendii townsendii 26 May 1916
• Urocitellus beldingi oregonus 15 Jul 1916
• Neotoma cinerea alticola 10 Jul 1916
• Tamias amoenus amoenus 16 Oct 1916
• Microtus montanus montanus 16 Oct 1916
• Microtus montanus montanus 1 Aug 1916
• Peromyscus maniculatus gambelii 16 Oct 1916
• Urocitellus canus May 1916
• Peromyscus maniculatus sonoriensis 8 Jul 1916
• Sylvilagus nuttallii nuttallii 12 Jun 1916
• Lasionycteris noctivagans 22 Aug 1916
• Castor canadensis baileyi 19 Oct 1916
• Neotoma cinerea alticola 25 Aug 1916
• Neotoma cinerea alticola 11 Jul 1916
• Thomomys townsendii townsendii 11 May 1916
• Microtus montanus montanus 2 Aug 1916
• Peromyscus maniculatus sonoriensis 26 Sep 1916
• Peromyscus maniculatus gambelii 4 Oct 1916
• Thomomys townsendii townsendii 30 May 1916
• Peromyscus maniculatus sonoriensis 12 Jun 1916
• Neotoma cinerea alticola 9 Oct 1916
• Thomomys townsendii townsendii 30 May 1916
• Thomomys townsendii townsendii 15 May 1916
• Peromyscus maniculatus gambelii 16 Oct 1916
• Thomomys townsendii townsendii 19 May 1916
• Microtus montanus montanus 4 Oct 1916
• Peromyscus maniculatus sonoriensis 3 Jun 1916
• Ochotona princeps taylori 26 Aug 1916
• Neotoma cinerea alticola 9 Oct 1916
• Microtus montanus montanus 10 Aug 1916
• Microtus montanus montanus 1 Aug 1916
• Thomomys townsendii nevadensis 25 Sep 1916
• Peromyscus maniculatus gambelii 17 Oct 1916
• Microtus montanus montanus 31 Jul 1916
• Peromyscus maniculatus sonoriensis 26 May 1916
• Peromyscus maniculatus sonoriensis 27 May 1916
• Tamias amoenus amoenus 11 Jul 1916
• Peromyscus crinitus crinitus 9 Jun 1916
• Tamias minimus scrutator 17 Sep 1916
• Thomomys townsendii townsendii 31 May 1916
• Peromyscus maniculatus gambelii 9 Oct 1916
• Tamias amoenus amoenus 15 Aug 1916
• Callospermophilus lateralis trepidus 28 Jun 1916
• Thomomys townsendii townsendii 29 May 1916
• Mustela frenata nevadensis 26 Aug 1916
• Brachylagus idahoensis 21 Jul 1916
• Peromyscus maniculatus gambelii 17 Oct 1916
• Thomomys townsendii townsendii 29 May 1916
• Zapus princeps oregonus 18 Aug 1916
• Microtus montanus montanus 13 Sep 1916
• Peromyscus maniculatus sonoriensis 1 Jun 1916
• Thomomys townsendii townsendii 15 May 1916
• Lepus californicus deserticola 8 Jul 1916
• Urocitellus canus 27 Jul 1916
• Thomomys townsendii townsendii 20 May 1916
• Urocitellus canus 27 May 1916
• Brachylagus idahoensis 21 Jul 1916
• Peromyscus maniculatus sonoriensis 31 Jul 1916
• Microtus longicaudus longicaudus 2 Sep 1916
• Urocitellus canus 14 May 1916
• Dipodomys ordii columbianus 16 Sep 1916
• Microtus longicaudus longicaudus 2 Sep 1916
• Lepus californicus deserticola 13 May 1916
• Ondatra zibethicus osoyoosensis 8 Sep 1916
• Thomomys townsendii townsendii 30 May 1916
• Neovison vison energumenos 17 Oct 1916
• Urocitellus beldingi oregonus 25 Jun 1916
• Thomomys townsendii townsendii 24 May 1916
• Microtus montanus montanus 1 Aug 1916
• Sylvilagus nuttallii nuttallii 2 Jun 1916
• Kerodon rupestris 26 Aug 1913
• Peromyscus maniculatus sonoriensis 16 Aug 1916
• Microtus longicaudus longicaudus 9 Oct 1916
• Microtus montanus montanus 19 Sep 1916
• Peromyscus maniculatus sonoriensis 22 Aug 1916
• Urocitellus beldingi oregonus 13 Jul 1916
• Galea spixii 17 Aug 1913
• Thomomys talpoides quadratus 4 Jul 1916
• Thomomys townsendii townsendii 15 May 1916
• Peromyscus maniculatus gambelii 17 Oct 1916
• Tamias minimus scrutator 27 Jul 1916
• Peromyscus maniculatus sonoriensis 28 May 1916
• Thomomys townsendii nevadensis 16 Sep 1916
• Marmota flaviventris avara 13 Jun 1916
• Peromyscus maniculatus sonoriensis 30 Jul 1916
• Peromyscus maniculatus sonoriensis 1 Jun 1916
• Neotoma cinerea alticola 4 Oct 1916
• Peromyscus maniculatus gambelii 13 Jul 1916
• Peromyscus maniculatus sonoriensis 11 Sep 1916
• Peromyscus crinitus crinitus 3 Aug 1916
• Peromyscus maniculatus sonoriensis 26 Sep 1916
• Thomomys townsendii nevadensis 25 Sep 1916
• Mustela frenata nevadensis 3 Sep 1916
• Microtus montanus montanus 19 Sep 1916
• Microtus montanus montanus 9 Sep 1916
• Neotoma cinerea alticola 4 Oct 1916
• Neotoma cinerea alticola 12 Jul 1916
• Neotoma cinerea alticola 15 Jun 1916
• Spilogale gracilis gracilis 23 Sep 1910
• Neotoma cinerea alticola 10 Jul 1916
• Microtus montanus montanus 26 Sep 1916
• Thomomys townsendii nevadensis 22 Sep 1916
• Peromyscus maniculatus gambelii 9 Oct 1916
• Thomomys townsendii townsendii 11 May 1916
• Microtus montanus montanus 20 Sep 1916
• Callospermophilus lateralis trepidus 27 Aug 1916
• Peromyscus maniculatus sonoriensis 31 Jul 1916
• Neotoma cinerea alticola 26 Jun 1916
• Peromyscus maniculatus sonoriensis 31 Jul 1916
• Thomomys talpoides quadratus 13 Jul 1916
• Urocitellus canus 15 May 1916
• Dipodomys ordii columbianus 14 May 1916
• Tamias amoenus amoenus 18 Aug 1916
• Urocitellus canus 14 May 1916
• Peromyscus crinitus crinitus 12 Jul 1916
• Sylvilagus nuttallii nuttallii 8 Jul 1916
• Thomomys talpoides quadratus 17 Aug 1916
• Thomomys talpoides quadratus 6 Jul 1916
• Microtus montanus montanus 16 Sep 1916
• Mephitis mephitis major 23 Sep 1916
• Peromyscus maniculatus sonoriensis 28 May 1916
• Dipodomys ordii columbianus 17 Sep 1916
• Thomomys townsendii townsendii 12 May 1916
• Thomomys townsendii townsendii 12 May 1916
• Thomomys townsendii townsendii 31 May 1916
• Microtus montanus montanus 16 Oct 1916
• Peromyscus maniculatus sonoriensis 13 Jun 1916
• Thomomys talpoides quadratus 16 Oct 1916
• Urocitellus canus 27 May 1916
• Tamias minimus scrutator 16 May 1916
• Perognathus parvus parvus 16 Sep 1916
• Lepus californicus deserticola 27 May 1916
• Microtus montanus montanus 26 Sep 1916
• Peromyscus maniculatus sonoriensis 27 May 1916
• Sylvilagus nuttallii nuttallii 23 Sep 1916
• Tamias minimus scrutator 10 Jul 1916
• Urocitellus canus 26 May 1916
• Thomomys talpoides quadratus 1 Aug 1916
• Neotoma cinerea alticola 15 Jun 1916
• Dipodomys ordii columbianus 22 Sep 1916
• Neotoma cinerea alticola 1 Jul 1916
• Marmota flaviventris avara 13 Jul 1916
• Tamias amoenus amoenus 17 Aug 1916
• Dipodomys ordii columbianus 2 Jun 1916
• Tamias minimus scrutator 26 May 1916
• Peromyscus maniculatus gambelii 17 Oct 1916
• Neotoma cinerea alticola 11 Jul 1916
• Peromyscus maniculatus gambelii 17 Oct 1916
• Thomomys townsendii townsendii 31 May 1916
• Thomomys townsendii townsendii 11 May 1916
• Peromyscus maniculatus sonoriensis 23 Aug 1916
• Peromyscus maniculatus sonoriensis 27 Sep 1916
• Urocitellus beldingi oregonus 27 Jun 1916
• Neotoma cinerea alticola 9 Jun 1916
• Microtus montanus montanus 9 Sep 1916
• Thomomys townsendii townsendii 11 May 1916
• Thomomys townsendii townsendii 25 May 1916
• Thomomys talpoides quadratus 19 Oct 1916
• Tamias minimus scrutator 24 Jun 1916
• Zapus princeps oregonus 31 Aug 1916
• Microtus montanus montanus 10 Sep 1916
• Microtus montanus montanus 11 Sep 1916
• Microtus longicaudus longicaudus 16 Oct 1916
• Dipodomys ordii columbianus 3 Aug 1916
• Microtus longicaudus longicaudus 1 Sep 1916
• Ondatra zibethicus osoyoosensis 8 Sep 1916
• Peromyscus maniculatus gambelii 3 Oct 1916
• Thomomys townsendii townsendii 30 May 1916
• Ondatra zibethicus osoyoosensis 11 Oct 1916
• Peromyscus maniculatus sonoriensis 26 Sep 1916
• Thomomys talpoides quadratus 1 Aug 1916
• Brachylagus idahoensis 21 Jul 1916
• Urocitellus canus 15 May 1916
• Tamias amoenus amoenus 19 Oct 1916
• Tamias amoenus amoenus 20 Aug 1916
• Thomomys talpoides quadratus 5 Oct 1916
• Perognathus parvus parvus 27 Jul 1916
• Peromyscus maniculatus sonoriensis 14 Jun 1916
• Thomomys talpoides quadratus 30 Jul 1916
• Peromyscus maniculatus sonoriensis 16 Aug 1916
• Castor canadensis baileyi 20 Oct 1916
• Microtus montanus montanus 17 Oct 1916
• Peromyscus maniculatus gambelii 19 Oct 1916
• Thomomys talpoides quadratus 22 Aug 1916
• Tamias minimus scrutator 20 May 1916
• Neotoma cinerea alticola 12 Jun 1916