SaateksPost, VoldemarAeromehaanika1937 / 1 lk https://digikogu.taltech.ee/et/Item/d4d077f0-f80b-40f0-8da6-39c8e20cebdb https://www.ester.ee/record=b1319697*est

Tulekindel ehitusviis "Nopsa"Grauen, Andres; Alver, Valter1936 https://www.ester.ee/record=b1208510*est https://digikogu.taltech.ee/et/Item/ba07ace8-de1f-41b4-81e4-951aa53ba47b