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NIOSH/OSHA pocket guide to chemical hazards / editors, Frank W. Mackison, National Institute for Occupational Safety and Health, R. Scott Stricoff, Lawrence J. Partridge, Jr., A.D. Little, Inc. (OCLC #8734681)

This volume has a date of “September 1978” on its title page and a suggestive “78” as part of its publication number, but this printing history on the title page verso:

  Second printing - January 1980
  Third Printing - August 1980
    with minor technical changes
  Fourth Printing - August 1981
    with minor technical changes

but does that merit a new (1981) record in OCLC?

I checked the edition section of their When to Input a New Record document, and was unsure. It may fall under “difference in content”?

Either way, a full and popular record already exists for this printing, with a 1981 date and a note:

500 __ ǂa "Fourth printing, August 1981, with minor technical changes."

This record most precisely matched what I had in hand, so worked well for copy cataloging.

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The warlock’s book : secrets of black magic from the ancient grimoires / by Peter Haining ; illustrated by George Underwood based on original woodcuts. (OCLC #6671654)

In OCLC, variation in printing, manufacture or distribution date alone does not justify creating a new record. Though this item was printed in 1973, the manifestation (edition) was published in 1971, so we can use a 1971 record. A printing date can additionally be recorded in the record:

260 __ ǂa Secaucus, N.J. : ǂb Citadel Press, ǂc [1971], 1973 printing.

but only the publication information goes in the fixed fields:

DtSt: s   Date1: 1971  Date2: ____