Bölkow Bo 207 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Bölkow Bo 207" in English language version.

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Gerhardt, Peter (1990). "The Bolkow Lightplanes Part Two". Archive. 1990 (2). Air-Britain: 49–50. ISSN 0262-4923.
Gerhardt, Peter (1990). "The Bolkow Lightplanes Part Three". Archive. 1990 (3). Air-Britain: 73–76. ISSN 0262-4923.