Full text
PDF
. 1951 Jul;39(3):203–205.
Microfilms in Relation to Reference Service
1Washington, D. C.
PMCID: PMC195116 PMID: 14848626
. 1951 Jul;39(3):203–205.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.