Areawide land capabilities and natural resources utilization study, FIVCO ADD : Greenup, Boyd, Carter, Elliott, Lawrence / prepared by Mayes, Sudderth & Etheredge, Inc. (OCLC #871201008)
This large folded map shares most metadata (title, creator, date down to the month) with a book we already have in storage, though its record doesn’t mention an accompanying map of FIVCO (“the five county area”).
If I’d had both of these in hand initially, I probably would have cataloged them together, with a physical description like:
300 __ ‡a 62 pages ; ‡c 28 cm + ‡e 1 folded map.
(note the lack of period after the cm, that would have been there under AACR2!)
Substantive accompanying materal does justify a new record in OCLC, so I didn’t want to just tack it on to our local book record. I passed it on to our map cataloger, who added it to our map collection with its own original record.