Impact Factor
2.71
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. 63 (2015).
Also issued online.
Microfilm. v. 1 (1935)-9 (1951). 2 microfilm reels : negative ; 35 mm.
Contributions in English, French, or German, most with summaries in the other two languages.