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Wikipedia, for ex., 4 letters

World Book, e.g.: Abbr., 4 letters

Britannica, for one (abbr.), 4 letters

Depend add-on, 4 letters

Large ref. work, 4 letters

Ref. book, 4 letters

Ref. set, 4 letters

Reference bk., 4 letters

Reference work: Abbr., 4 letters

Suffix with consist, 4 letters

Suffix with depend, 4 letters

Wikipedia, for one (abbr.), 4 letters

Atlas shelfmate: Abbr., 5 letters

Britannica, for one: Abbr., 5 letters

Dict. shelfmate, 5 letters

Funk & Wagnalls offering: abbr., 5 letters

It comes in volumes: Abbr., 5 letters

Multivolume ref., 5 letters

Multivolume ref. work, 5 letters

Multivolume ref., usually, 5 letters

Ref. bk., 5 letters

Ref. set, 5 letters

Ref. work, 5 letters

Reference on a CD, 5 letters

Work in volumes: Abbr., 5 letters

Circular, 8 letters

Reference book, 12 letters

A reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty, 12 letters

Boy detective of kiddie lit, 17 letters

Sets of reference books: Abbr., 5 letters

Encapsulate, 6 letters

Form into a sac, 6 letters

Formed a sac, 8 letters

Large genus of epiphytic and lithophytic orchids of tropical and subtropical Americas and West Indies, 8 letters

Formerly included in genus Epidendrum, 8 letters

A letter from the pope sent to all Roman Catholic bishops throughout the world, 10 letters

A reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty, 13 letters

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