Impact Factor
2.65
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.
Print issues ceased with v. 105, no. 2 (2013).
Also issued online.
Microfilm. v. 1 (1909)-v. 43 (1951), v. 49 (1957), v. 51 (1959). 18 microfilm reel : negative ; 35 mm.
19950524 Not printed on acid-free paper