Pledge, H.T. <br/><br/>
Science since 1500  a short history of mathematics, physics, chemistry, biology 
H. T. Pledge. 
 - London  Majesty's Stationery Office  1939 
 - 356p.: ill.; 22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics Science - History  Chemistry  Ecology; Astronomy. 
<br/><br/><label>Dewey Class. No.: </label>509  / P62S