Tunnel Shields and the Use of Compressed Air in Subaqueous Works, by William Charles Copperthwaite ... With 260 Illustrations and Diagrams.W. C. Copperthwaite1906EN
A guide to animal tracking and behavior.Donald W. Stokes and Lillian Q. Stokes, range maps by Leslie Cowperthwaite, tracks by Donald W. Stokes1986PDF17 MBEN