"This fourth edition represents an unrevised cumulation of the changes since 1965 merged into the text of the previous edition"--Pref."Additions and c...
"This fourth edition represents an unrevised cumulation of the changes since 1965 merged into the text of the previous edition"--Pref.
"Additions and changes in Class L adopted while this work was in press will be cumulated and printed in List 217 of LC classification--additions and changes"--T.p. verso.