Literature

Israel SpezialKatalog [Handbuch in Lieferungen] issued by the BundesArbeitsGemeinschaft Israel im Bund Deutscher Philatelisten, the paragraphs on Wasserzeichen [watermarks]
The Watermarks on Israel Stamps, by P. Kanner, in The Holy Land Philatelist 1956 June, nr. 20, page 502-505.
Watermarks in Israel, by H.H. Hirst, in BAPIP, nr. 14, October 1955, page 1-5.
Watermarks in Israel, by M. Hesky [Israel Postal Services], in BAPIP, nr 19, December 1956, page 21.
M. Hesky asked about new paper supplies, in BAPIP, nr. 20, April 1957, page 26.
Watermarks in Israel, by H.H. Hirst, in BAPIP, nr. 17, July 1956, page 16.
Paper Manufacture and Grain, by Jaap Mebus, in Machins, Part II. How to identify varieties of Decimal Low Values, GUIDEC nr. 131, 1987 pages G.131.1-5.
Israel Postage Stamps 1948-1988 Catalogue no. 11, edited by Yacov Tsachor, Israel Postal Authority/Philatelic Service.
Watermarks in Israel, in BAPIP, nr. 25, July 1958, pages 10-11.
Twelve tribes an update, S. Abraham, in IPBJ, nr. , 1987, page 312-313.
Photogravure and Watermark, by H.H. Hirst, in BAPIP, nr. 6, october 1953, page 1-3.
Israel Air Mail Labels with control nummer and watermarks, by P. Kanner, in BAPIP, nr. 35, april 1961, page 21,xd.