[9] Ibid. page 73.
[10] Ibid. pp. 91 and 102.
[11] Airships Past and Present.
[12] Hildebrandt.
[13] Hildebrandt.
[14] Hildebrandt. Airships Past and Present.
Transcriber’s Notes
Punctuation and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.
Simple typographical errors were corrected; occasional unbalanced quotation marks retained. Missing or incorrect accent marks in non-English words were not changed.
Ambiguous hyphens at the ends of lines were retained; occurrences of inconsistent hyphenation have not been changed.