Rick A
Active Member
The Road-master's Assistant and Section-master's Guide: A Manual of ...1877
by William S. Huntington , Charles Latimer
https://archive.org/details/roadmas...de/2up/search/railroad+frogs?q=railroad+frogs
by William S. Huntington , Charles Latimer
https://archive.org/details/roadmas...de/2up/search/railroad+frogs?q=railroad+frogs