Introduction to Material Science
https://eng.libretexts.org/Courses/California_State_Polytechnic_University_Humboldt/Mechanics_and_Science_of_Materials
Crystallography
https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Crystallography_in_a_Nutshell_(Ripoll_and_Cano)/01%3A_Chapters