Manual of the families and genera of North American diptera/
Williston, Samuel Wendell 1851-1918
Manual of the families and genera of North American diptera/ by Samuel W.Williston - 2nd ed. rewritten and enlarged - liv, 167 pages; 20cm
Includes bibliographical references and indexes
Diptera
Diptera--North America
QL531
Manual of the families and genera of North American diptera/ by Samuel W.Williston - 2nd ed. rewritten and enlarged - liv, 167 pages; 20cm
Includes bibliographical references and indexes
Diptera
Diptera--North America
QL531