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On the variation of species, with especial reference to the Insecta : followed by an inquiry into the nature of genera / by T. Vernon Wollaston.

Studies in language variation : semantics, syntax, phonology, pragmatics, social situations, ethnographic approaches / edited by Ralph W. Fasold and Roger W. Shuy.

Variation / edited by Benedikt Hallgrímsson, Brian K. Hall.

The variation of animals and plants under domestication. / by Charles darwin, M.A., F.R.S. In two volumes ; with illustrations.

Genetic variation / edited by Rafael Trindade Maia, Magnólia De Araújo Campos.

Analyzing variation in language : papers from the second colloquium on new ways of analyzing variation / edited by Ralph W. Fasold and Roger W. Shuy.

Phases of animal life : past and present / by R. Lydekker ...

Genetic diversity and natural selection; / [by] James Murray.

Are the effects of use and disuse inherited? : an examination of the view held by Spencer and Darwin / by William Platt Ball.

L'italiano e le sue varietà / Sergio Lubello, Claudio Nobili.

The evolution of genetic systems / C. D. Darlington.

The variation of animals and plants under domestication / by Charles Darwin.

Mutants and hybrids of the Oenotheras / [by] D. T. MacDougal; assisted by A. M. Vail, G. H. Shull and J. K. Small.

Selection and cross-breeding in relation to the inheritance of coat-pigments and coat-patterns in rats and guinea-pigs / Hansford MacCurdy and William Ernest Castle.

Meaning and linguistic variation : the third wave in sociolinguistics / Penelope Eckert (Stanford University, California).

Linguistic variation : models and methods / edited by David Sankoff.

Variation in mammalian populations : the proceedings of a symposium held at the Zoological Society of London on 14 and 15 November, 1969 / edited by R. J. Berry [and] H. N. Southern.

Experimental zoölogy / by Thomas Hunt Morgan.

Nutation and forced motion of the earth's pole : from the data of latitude observations / by Ye. P. Fedorov ; translated from the Russian by Bertha Swirles Jeffreys, with a foreword by Sir Harold Jeffreys.

Animal diversity / by Milton Fingerman.

Mutations, variations and relationships of the oenotheras / Daniel Trembly MacDougal, A. M. Vail and George Harrison Shull.

Diversity of insect faunas / edited on behalf of the [Royal Entomological] Society by L.A. Mound and N. Waloff.

English around the world : an introduction / Edgar W. Schneider.

Multilingualism : understanding linguistic diversity / John Edwards.