The Collaborative International Dictionary of English v.0.48:

casebook \case"book`\ n.
   a book in which detailed written records of cases are kept
   and which are a source of information for subsequent work.
   Such books are often used as supplements to texts in law
   schools.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

casebook
    adj 1: according to or characteristic of a casebook or textbook;
           typical; "a casebook schizophrenic"; "a textbook example"
           [syn: casebook, textbook]
    n 1: a book in which detailed written records of a case are kept
         and which are a source of information for subsequent work

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "casebook":
   abecedarium, abecedary, alphabet book, atlas, battledore, calendar,
   catalog, catalogue raisonne, city directory, classified catalog,
   concordance, cyclopedia, diatesseron, dictionary catalog,
   directory, encyclopedia, exercise book, gazetteer, gradus, grammar,
   harmony, hornbook, index, manual, manual of instruction,
   phone book, polyglot, primer, reader, record book, reference book,
   schoolbook, source book, speller, spelling book, studbook, t,
   telephone book, telephone directory, text, work of reference,
   workbook