Check list of Oregon Rhopalocera
Subtitle: with county records and flight periods.
Series: Mid-continent lepidoptera series -- v. 4 (no. 57)
Publisher: John H. and Wilma L. Masters
Published: 1972
Place of publication: Saint Paul, Minn
Language: eng
Number of pages: 11
Subjects: Butterflies -- Oregon
Notes: Cover title.