"Potter's new cyclopaedia of botanical drugs and preparation / by R. C. Wren ; rewritten by Elizabeth M. Williamson and Fred J. Evans ; foreword by T. E. Wallis, 1988. - . - LCNA (CD OCLC), 1994-03. - . -"@fr . . "Richard Cranfield Wren (1864-1931)"@fr . "Botaniste" . "2013-07-26"^^ . . . . . "1864"^^ . "Botaniste"@fr . . . "VIAF" . "Botaniste" . "1931" . "Richard Cranfield Wren" . "12411009"^^ . . . "1994-08-09" . "1864" . . . "Wren" . "2013-07-27" . . . . . . . "1931"^^ . "0000000081251098" . . "Richard Cranfield" . . . .