McGraw-Hill Book Co
Possible match — there are several people named McGraw-Hill Book Co; this may not be the one in these credits.
McGraw Hill Book Company — publisher (1909-1917)
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Filmography in the catalog
Credited on 245 films (1940–1978) — matched by name in the Creator or Credits field. Also mentioned in 440 other records (descriptions, transcriptions, copyright notes).