Field Manual for Engineers. E-book. Formato PDF Philetus H. Philbrick   -  Forgotten Books, 2017  - 

Page The Reconnoissance 5 The Preliminary Survey 5 The Location 5 The Organization of the Transit Party 8 The Compass What kind to use and when to use it 8 Requirements for a Successful Reconnoissance 9 Train Resistances. 10 Total Ascent the Main Test of Gravity Resistance.