The Wikipedia page [Sample-return mission](https://en.wikipedia.org/wiki/Sample-return_mission) and [this answer](https://space.stackexchange.com/a/28247/12102) list Luna 16, 20 and 24 missions as each bringing back of the order of 100 grams of lunar material to Earth, but their Wikipedia pages don't say much about how this was done. There's a graphic which gives the basic idea, but are there better sources and descriptions for how this was done step-by-step?

How was the material identified, collected, and transported to the return capsule, and how was that capsule sealed and readied for spaceflight and reentry?

[![enter image description here][1]][1] [Source](https://en.wikipedia.org/wiki/File:Luna24-mission-nasa.jpg)


  [1]: https://i.sstatic.net/r0BdL.jpg