下载 APKPure App
可在安卓获取Soap-Making Manual的历史版本
阅读“肥皂制造手册;实用手册”，由Thomssen！
Read "Soap-Making Manual
A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant." by Edgar George Thomssen!
Once you install this app, you can read it by 1-click without connecting network.
You can also check your "Reading Score" from the menu.