With the exception of the typographical corrections detailed below and some minor corrections for missing periods or extra punctuation (item 28 in List of Figures), the text presented here is that contained in the original printed version. A transcription of the Data presented in Figure 12 was added to illustrate the information contained on that sheet. Some text was moved to rejoin paragraphs. The list of UK publications was moved to the end of the document. In writing variables for formulae, superscripted characters are shown using a caret (^). So, X squared would be X^2. Subscripts are shown using an underscore. Carbon dioxide is CO_2. Where several superscript or subscript character(s) are required or to aid in clarity, they are placed in braces (ex., H_{2}O for water and [theta]_{Npt.} for theta degrees from the North point). Emphasis Notation _Text_ = Italics Typographical Corrections Page Correction 385 flght => flight 394 diargrams => diagrams 404 Determinaton => Determination 411 obsever => observer 419 Morover => Moreover 425 Mississippii => Mississippi 425 a => as 430 at => and 431 inserted "a" ("...traveling along a certain topographic feature...") 442 concensus => consensus 472 Stephens, Loyd A. => Stevens, Lloyd A.