Impact Factor
3.10
Estimated influence, citation density, publishing volume, and citation integrity from the analytics table.
Volume, recency, access pattern, and citing-community signals from the journal analytics record.
Recent article records with DOI-first linking and condensed abstracts.
Special issues accompany some vols.
Also issued online.
Microfilm. v. 1 (1936)-14 (1950). 5 microfilm reels : negative ; 35 mm.
Vol. 59, no. 2 (FEB 1995)19950523 Notice not published Printed on acid-free paper