Books on clays - Available - pl contact for physcial copy:
heavyclaytechnologies@gmail.com 
Link to buy on Amazon/Flipkart
https://www.amazon.in/dp/B0H27425J1?&tag=notionpcom-21
https://www.flipkart.com/clays-brick-maker-essentials-brickmaking-clay/p/itma3e7c3159757a?pid=9798904791032&affid=editornoti&affid=editornoti