2.5B10.

Give the number of leaves or pages of plates after the paging if the leaves or pages of plates are numbered. If the leaves or pages of plates are unnumbered, give the number only when the plates clearly represent an important feature of the book. Otherwise, generally do not count unnumbered leaves or pages of plates.

N.B. The Library of Congress applies the LCRI as written, which results in a reduction of data given in the bibliographic record. Other libraries may wish in certain, or indeed in all, cases to give the fuller data without this reduction. In this respect bibliographic records must be considered equally valid or "correct," no matter which of the two practices is followed. This policy is especially important in the context of LC’s handling records originally created by other libraries when LC is using them in its own cataloging; the fuller data should be left "as is."

See also:

2.5B. Number of volumes and/or pagination