Twenty Years of Loten

A really hard to find book.
If you can find a copy, buy it.
It's a great summary of the history of Eurorack.

Don't buy Crap :-)

Loten is German for Soldering

The edition was printed for NAMM 2015

Quite a bit on the early modules from Doepfer on Munich and Analogue Systems of Cornwall in England

It's a small but beautiful book.

There is a bit of info re Vermona who had to re design their instruments post German Unification.
Vermona hailed from the East and were not accustomed to the business practices of the West.

Its very interesting to read how things develop.
Eurorack started in Germany, but almost at the same time a similar system was being developed by Bob Williams of Analogue Systems in Cornwall, England.

 Around 1995 , on both sides of the English Channel the idea of condensing 5U modules into a 3U space was taking root.... Both companies, unaware of one anothers designs adopted 3.5mm jacks instead of 1/4 inch.
Both companies also chose a 3U module height. However, their modules were not easy to swap into each others systems. They each had different power configurations and there was no standardization as to where the red stripe went.

Jomox

Jomox - X base 09

Since the early days the Eurorack scene has grown exponentially.