TY  - BOOK
AU  - Erdos, Paul L.
AU  - Morgan, Arthur J.
TI  - Professional mail surveys
U1  - 311.28 
PY  - 1970///]
CY  - New York
PB  - McGraw-Hill
KW  - Market surveys
KW  - Social Surveys
KW  - Public opinion polls
N1  - Includes bibliographical references (p. 276-277)
ER  -