Donner, Joakim Marine shells in the study of the Holocene/ Joakim Donner. - Helsinki : Finnish Society of Sciences and Letters, 2017 - 55 p. : ill. - Bidrag till Kannedom av Finlands natur och Folk H. 202 ISSN 0067-8481 . Includes bibliogr. references : p. 50-54 ISBN: 978-951-653-417-9 Subjects--Topical Terms: Marine shells