Vols. 54-55 include abstracts of papers presented at its 60th-61st Annual meeting, 1964-65.

Volume editor is the leading authority in the field Alphabetically organized in two volumes c.700 comprehensively signed, cross-referenced and indexed entries Detailed bibliographies and suggestions for further reading follow most entries Fully illustrated: over 300 plates and line drawings Written by an editorial team of over 270 experts from over thirty countries