Butterflies of Rocky Mountain National Park, Colorado
Subtitle: checklist and field summary, 1955 and 1956
By: by Philip C. Ritterbush.
Series: Mid-continent lepidoptera series -- v. 4 (no. 50)
Publisher: John H. and Wilma L. Masters
Published: 1972
Place of publication: Saint Paul, Minn
Language: eng
Number of pages: 12
Subjects: Butterflies -- Colorado -- Rocky Mountain National Park
Notes: Cover title.