All 1 Ong Sing Poen releases on Paperback Book
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![Cover for Ong Sing Poen · Microprojection with X-Rays (Paperback Book) [Softcover reprint of the original 1st ed. 1959 edition] (1946)](https://imusic.b-cdn.net/images/item/original/095/9789401767095.jpg?ong-sing-poen-1946-microprojection-with-x-rays-paperback-book&class=scaled&v=1438029327)