Just found that these Bauhaus books as downloadable PDFs on this website: https://monoskop.org/Bauhaus
“The following nine PDFs are linked from the Bibliothèque Kandinsky which published them online on an unknown date (follow this link to explore the respective entries on its website). This is an important milestone in the digitisation of essential but hard-to-get art publications for the public use and we would like to express our gratitude and appreciation. <3 ! The whole set of these high-quality digital facsimiles is about 1 GB large, if anyone feels like starting a torrent to relieve bandwidth of the library let us know and we'll include your link here. (17 Aug 2014). Update: you can now download the whole set in a single ZIP file from here. Thanks to Gabriel Benderski. (29 Aug 2014)”