key to the principal orders and families of insects
By: by Z.P. Metcalf and C.L. Metcalf.
Contributors: Metcalf, C. L. 1888-1948.
Edition: 3rd ed., rev. --
Publisher: Z. Metcalf & C. Metcalf
Published: 1928
Place of publication: [s.l.]
Language: eng
Number of pages: 23
Subjects: Insects -- Classification; Entomology.