Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 566
y slow, and radium itself decaysand changes to other elements so rap-idly that it is impossible for it to ac-cumulate naturally in visible masses..Minerals that carry radium, however,are fairly easy to determine. One ofthem, pitchblende, as generally found,is a black mineral about as heavy… … San Francisco, Cal., April i<), l9Ui elephones D<mel«» ^J^ SCHUMACHER WALL BOARD Main oHice and factory, 58th, San J^CdrO ^^^^^^ ^^^^^ ^ UNIVERSAL BED Latest and Best in Wall Beds. This bed is not fastened to any door ordoor jamb. It is portable--movable-youcan move it to any part of the room…
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