Sane occultism, by Dion Fortune. (OCLC #466116)
MARC 010 holds the Library of Congress control number (LCCN), but bibliography numbers assigned by other national agencies are recorded in 015.
For example, this record has an LCCN:
010 __ ǂa 68134885
but also a number from the British National Bibliography:
015 __ ǂa B68-18038
though if you look at its record in that bibliography, the identifier is formatted differently:
GB6818038