The Internet Archive has scans of the second edition of Calculus Made Easy, from 1914 [1]. The book is also available as PDF and TeX at Project Gutenberg [2].

The Internet Archive has scans of the second edition of Calculus Made Easy, from 1914 [1]. The book is also available as PDF and TeX at Project Gutenberg [2]. The calculusmadeeasy.org website does include at least one useful footnote that the other versions don’t: “The term billion here means 10^12 in old British English, ie, trillion in modern use.” [3] [1] https://archive.org/details/CalculusMadeEasy/page/n3/mode/2up https://archive.org/details/CalculusMadeEasy/page/n3/mode/2u... [2] https://www.gutenberg.org/ebooks/33283 https://www.gutenberg.org/ebooks/33283 [3] https://calculusmadeeasy.org/2.html#fn1 https://calculusmadeeasy.org/2.html#fn1