Schroen, Heinrich Ludwig Friedrich. **#F.5011.57 Seven-figure logarithms of numbers from 1 to 108000 and of sines [etc] to every 10 seconds of the quadrant, with a table of proportional parts. 5th ed. Description of tables by A. De Morgan. London. Vieweg. 1865. ix, (1), 474, 76 pp. 8°
-Tables, GD. nereticer.-Logaritnns.
-De Morgan, Augustus.