Apart from J. B Nation's [Notes on Lattice Theory](https://math.hawaii.edu/%7Ejb/), is there any other (mostly introductory) material on Lattices available online?


**NB**: The last update of Nation's notes was 2017, as of Feb 2023.



Online introduction to Lattice Theory?
For something brief to begin with see the [notes](http://www.rasmusen.org/GI/lattice.theory.notes.txt) by Eric Rasmusen, the introductions to lattice theory by [Zukowski](http://mizar.org/JFM/pdf/lattices.pdf) and [Wang](http://www.math.s.chiba-u.ac.jp/%7Ewang/research/coin/lattice.pdf)


[An essay on history](http://www.ams.org/notices/199711/comm-rota.pdf), somewhat from a personal view, by Giancarlo Rota is also nice.


