Hi!
> Even this query gives certain ambiguous values like 'SM', 'BM', 'Q', etc.
> What do these values mean?
My guess is that the one & two letter values are abbreviations, e.g.:
SM = Semimonthly
BM = Bimonthly
Q = Quarterly
0 = Irregular...
Current cataloging under RDA (Resource Description and Access) avoids abbreviations because they can be very ambiguous and confusing, so those abbreviations might be able to be upgraded to the full words, if that is what those abbreviations stand for.
There is also a place for codes for frequencies in a MARC21 record, field 008 position 18 in Continuing Resources records:
Perhaps those values in your records might help?
Cheerio!
h2
~~~~~~~~~~~~~~
Heather Hernandez (she, her, hers)
Technical Services Librarian
San Francisco Maritime National Historical Park Research Center
2 Marina Blvd., Bldg. E, 3rd floor, San Francisco, CA 94123-1284