Continuing 12.5E1

Revise examples to read:

volumes : illustrations ; 21 cm + slides

filmstrips : colour ; 35 mm + booklets

108 volumes : illustrations ; 25 cm + 18 maps (colour ; 65 x 90 cm or smaller)

(Ceased serial)

volumes (loose-leaf) : forms ; 25 cm + 2 computer discs (3 ½ in.)