Errors in punctuation and inconsistent hyphenation were not corrected unless otherwise noted.

The tables at the end of the book has been reformatted to fit the page width.

On page 2, "will he injured" was replaced with "will be injured".

On page 2, "maintenace" was replaced with "maintenance".

On page 2, "per centage" was replaced with "percentage".

On page 3, "Nicaragura" was replaced with "Nicaragua".

On page 3, "overand" was replaced with "overland".

On page 7, "extention" was replaced with "extension".

On page 9, "personallly" was replaced with "personally".