Reading source code of the early release/version is very helpful for beginner to digest complex project. There is less line of code and learner can see the progression of the project.
However, finding those early version is not easy. Those early work may be deemed as "useless" and not get publish online or include in version control system.
For example, python celery only has v2.1.1 as its earliest tag on Github
So what's your secret trick to find out those early work?