Exploring the Cosmic Frontier Andrei P. Lobanov, J. Anton Zensus, Catherine Cesarsky E-Book (pdf)

Amos und Hosea J. J. P. Valeton E-Book (pdf)

Structural Performance of Masonry Elements J. M. P. Q. Delgado, Ana Sofia Guimarães, António C. Azevedo E-Book (pdf)