සක්‍රීයතාවය

Warakadeniya, Chandra

සක්‍රීයතාවය = sakriyathawaya - udathalavinna : Author, 1999. - 29p.; ill.; 24cm

ISBN: 955-96435-1-7

Subjects--Topical Terms:
Science

Dewey Class. No.: 507 / WAR

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