American spiders /
Gertsch, Willis J. 1906-
American spiders / by Willis J. Gertsch - Princeton, N.J. : D. Van Nostrand Company, 1949 - xiii, 285 p. : ill., (part col.) ; 22 cm.
Bibliography : p. 271-272
49-011600
Spiders--North America
American spiders / by Willis J. Gertsch - Princeton, N.J. : D. Van Nostrand Company, 1949 - xiii, 285 p. : ill., (part col.) ; 22 cm.
Bibliography : p. 271-272
49-011600
Spiders--North America