You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ORDER BY `year` DESC, author) QQ WHERE `year`<2100 ORDER BY modified DESC LIM...' at line 1 Bibliographies | Miko Flohr
 

Combined Bibliography: Construction and Vault

Construction
Vault
Lancaster, L. (2015). Innovative Vaulting in the Architecture of the Roman Empire. Cambridge: Cambridge University Press.
Boyd, T.D. (1978). ‘The Arch and the Vault in Greek Architecture’. AJA 82.1: 83–100.