- http://geology.com/rocks/marble.shtml Marble: Metamorphic Rock: Pictures, Definition, Properties.
- https://www.reference.com/science/chemical-formula-marble-423aaeec81505d62 Chemical Marble Formula
- https://engineeringrome.wikispaces.com/Roman+Mining+and+Quarrying+Techniques+and+the+Reuse+of+Mines Romaning Mining
- http://www.academia.edu/3080968/Marbles_to_Rome_The_Movement_of_Monolithic_Columns_Across_the_Mediterranean Transport of Marble
- http://www.ancient.eu/column/
- http://www.ancient.eu/Roman_Architecture/
- http://www.romeartlover.it/Costroma.html
Monday, 22 August 2016
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