This example shows a single volume item with an accompanying separate volume of plates, each with an individual barcode. The basic piece constitutes the "text" while the accompanying piece constitutes the "maps."
Quaternary nonglacial geology : conterminous U.S. / edited by Roger B. Morrison. -- Boulder, Colo. : Geological Society of America, 1991. xiii, 672 p. : ill. (some col.), maps ; 29 cm. + 8 plates in case -- (The Geology of North America ; v. K-2) L.C. CALL NO: QE71.G48 1986 vol. K-2
RLIN holdings screen:
CALL QE71b.G48 1986 v.K-2 VOL ANT INS T FNT LOC LSM LCAL LVOL LANT LINS N LFNT COP 1 MDES CST C CCAL bQE71.G48 1986 v.K-2 text SHNT r39030... COP 1 MDES CST C CCAL bQE71.G48 1986 v.K-2 maps SHNT r39030...
NOTE: As an identifying label, prefer a term used on the piece itself whenever that term appears in the List of Approved Volume Designators. Lacking a term from the piece itself, use "text" for the basic piece and a term describing either contents (e.g., "maps" or "plates") or function (e.g., "suppl.") for the accompanying piece. In either case, the chosen term should also appear in the List of Approved Volume Designators.