Weavers of the Southern Highlands / Philis Alvic. (OCLC #884918404)

RDA 7.15 on Illustrative Content says “If the resource contains illustrative content, record illustration or illustrations, as appropriate.” There is an optional alternative to additionally (or instead) specify the types of illustrations (such as maps, coats of arms, or music) if they are important for identification or selection. The different national libraries have varying policies on this:

• Library of Congress/PCC: Generally do not be more specific
• National Library of Australia: Generally do be more specific.
• British Library: Generally do not, except for maps
• (I thought DA-C-H said to use your discretion, but don’t see that now)

Our local policy is to record specific types when they seem useful, so in this case I recorded the existence of both general illustrations and maps in the MARC 300 variable field:

300 __ ǂa 1 online resource (xxiv, 234 pages) :
                ǂb illustrations, maps

as well as in the fixed field:

Ills: ab__