Thank you so much for your prompt reply. *Raghav Arora* Sophomore, M.Sc (Hons) Chemistry BE Electrical and Electronics Engineering Contact : (+91) 9897597761 Personal Email <raghavarora999@yahoo.in> | University Email <f20171016@pilani.bits-pilani.ac.in> LinkedIn <https://www.linkedin.com/in/raghav-arora-9820a648/> | GitHub <https://github.com/RAraghavarora/> ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄ *Birla Institute of Technology and Science, Pilani* Pilani campus, Rajasthan-333031 On Wed, Jul 3, 2019 at 8:47 PM Hernandez, Heather <heather_hernandez@nps.gov> wrote:

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: https://www.loc.gov/marc/bibliographic/bd008s.html 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 415-561-7032, heather_hernandez@nps.gov Library catalog: http://keys.bywatersolutions.com/