The main areas where Core-Level guidelines touch Slavic cataloging are notes, subject analysis, and non-Roman fields.

Notes

The PCC guidelines state: "Only those notes that support identification of item need be included. Criteria may vary from one item to another. Notes are not required to justify added entries."
Notes specific to Slavic/Cyrillic cataloging are:
• Language notes
• Artistic Form notes
• Textbook notes
• At head of title notes
• Edition notes taken from the colophon

The above guidelines indicate that notes are not required for the "At head of title notes" and "artistic form notes".
The note "Authorized for instructional purposes" also does not seem to be required.
The pseudo-edition notes from the colophon are not useful for identification and can be left out.
Language notes help identify the script of the text and it seems should be retained.

Subjects

The guidelines state: "If appropriate, assign at least one or two subject headings from an established thesaurus or subject heading system recognized by the USMARC Format. Subject headings should be assigned at the appropriate level of specificity. "

The doubling or tripling of subject headings due to the Russia/Soviet Union/Former Soviet republics problem is too important to sidestep with this guideline.

• The Automated Bibliographic Control Committee of SEES recommends the following policy:

  "If appropriate, assign at least one or two headings from the SUBJECTS file and/or the NAMES file to represent the primary subject and/or form of the work at the appropriate level of specificity. --
  In cases of doubling or tripling of headings due to the assignment of Russia/Soviet Union/Former Soviet republics, keep the assignment of headings to the absolute minimum."

Non-Roman Fields

Although the decision to include data in non-Roman form in a BIBCO Core record is strictly optional, when that option is exercised, it must be done so according to the supplementary Guidelines for Multiple Character Sets. The Guidelines specify the minimum fields to be supplied in non-Roman script: 245, 246, 250, 260, and 4XX (mandatory if applicable) and 505 (as needed by the appropriate monographic core standard used). See also:
• Adding Cyrillic Parallel Fields to Bibliographic Records
• OCLC Macros for Cyrillic Parallel Fields