TY  - BOOK
TI  - Ulrich's international periodicals directory:  - 1990-91
AV  - REF Z 6941 .U5 
PY  - 1990///
CY  - New York
PB  - P.R. Bowker
KW  - Periodicals -- Directories
N1  - now including Irregular serials & annuals
ER  -