Abridged republication of Beyers Handarbeits-Bücher Band 55, edited by Marie Niedner and Gertrud Villforth, published in 1926 by Verlag Otto Beyer, Leipzig
and
the knitted lace section of Das Stricken, by Edith Wallach and Margarete Lang, published in 1922 by Verlag der Ullstein-Schnittmuster, Berlin.
Available from Lacis. Lacis has Gertrud “Billforth” - correct spelling according to German sources is Villforth.