I would like to collect some 19th century and early 20th science and technology books, those wouldn't have the ISBN. Electricity, telegraphy and radio, industri

I would like to collect some 19th century and early 20th science and technology books, those wouldn't have the ISBN. Electricity, telegraphy and radio, industrial production, that sort of things. History of technology is fascinating, and sometimes you can find those books very cheap or even get those for free from someone clearing their grandpas attic. edit: I don't own any but regret not buying one good collection recently for cheap, but it would have taken a considerable amount of space on the bookshelf. There's definitely difference in occasionally looking through physical book, the digital ones don't offer the same joy :-)