Apollo 17 Hasselblad image from film magazine 145/D - EVA-2, Post-EVA-3 & Orbit
This photo was used in Figure 5-23 of the Apollo 17 Preliminary Science Report (SP-330, 1973), which has the following caption:

Regolithic debris partly filling cracks and depressions on a large basalt block at station 5. Note relative lack of debris on flat and more exposed surfaces of the block. The gray scale on the gnomon is 30 cm long.

Text of the report refers to the figure:

Boulder surfaces are generally free of dust except in depressions on horizontal rock surfaces where dust and relatively coarse rock and mineral debris have accumulated (fig. 5-23). Fillets tend to be low on boulders on the valley floor, although isolated exceptions to this rule were observed, particularly near the Apollo lunar surface experiments package (ALSEP) deployment site.

Caption from Figure 137 of The Geologic Investigation of the Taurus-Littrow Valley: Apollo 17 Landing Site, Geological Survey Professional Paper 1080, Edward W. Wolfe, Norman G. Bailey, Baerbel K. Lucchitta, William R. Muehlberger, David H. Scott, Robert L. Sutton, and Howard G. Wilshire. US Government Printing Office, Washington, 1981.:

Locations of samples 75060-66 and 75075 before collection. Inset shows 75075 with reconstructed lunar surface orientation and lighting.