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- 30-41 cm is oversize -- location is normal location for that call number in Bird, subfield k OVERSIZE, then call number.
- 42+ cm is flat -- location is one of the bird,xl4 codes, subfield k FLAT, then call number (there was no |k before Jan. 2024).
Exceptions:
- For call numbers M (not ML or MT) or N-NX oversize begins at 36 cm.
- For M3 only, oversize is over 38 cm.
- Atlas Oversize is 31-50 cm
- Width of shelves in Atlas Collection is 23 cm. Anything 23 cm and over in width goes to Atlas Oversize. Holdings location is maps,atlsf, subfield k Atlas Oversize, then call number (Atlas measuring 28 x 24 would go to Atlas Oversize)
- Atlas flat is over 50 cm. The mfhd location for an atlas flat is maps,atlsh, subfield k Atlas Flat, then call number
- Per map librarian, if oversize Atlas item is unable to stand without flopping over, make it flat.
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