"Warren, Bertram Eugene"@en . . "1902Z"^^ . "Bertram Eugene Warren"@en . . "AMerican mineralogist" . "1991-06-27Z"^^ . "Bertram Eugene Warren (June 28, 1902 \u2013 June 27, 1991) was an American crystallographer. His studies of X-rays provided much knowledge and understanding of both crystalline and non-crystalline materials. He also worked on changing amorphous solids to a crystalline state."@en . "1991Z"^^ . "1902-06-28Z"^^ .