Smithsonian Year 1973 :
Smithsonian Institution
Smithsonian Year 1973 : Annual report of the Smithsonian institution for the Year ended June 30, 1974. - City of Washington : Smithsonian institution press, 1974. - 500 p. - Smithsonian Institution. Publication 5229 .
Science--Bulletin
Smithsonian Year 1973 : Annual report of the Smithsonian institution for the Year ended June 30, 1974. - City of Washington : Smithsonian institution press, 1974. - 500 p. - Smithsonian Institution. Publication 5229 .
Science--Bulletin