This is a personal project by @dellsystem. I built this to help me retain information from the books I'm reading.
Source code on GitHub (MIT license).
Braverman, H. (1974). 16. Service Occupations and Retail Trade. In Braverman, H. Labor and Monopoly Capital: The Degradation of Work in the Twentieth Century. Monthly Review Press, pp. 359-374
(adjective) incapable of being surmounted, overcome, passed over, or solved
And if we do not take this view we fall into insuperable difficulties