# References on integration: collections of fully worked problems (and explanations) of (1) advanced and (2) unusual techniques

I am searching for two kinds of books.

(1) Comprehensive books that collect, explain, and provide many examples (that is, fully worked problems) of advanced integration techniques (that is,
something at the level of difficulty of the tables written by
Gradshteyn and Ryzhik, but obviously with explanations, examples and
proofs).

(2) Comprehensive books that collect, explain, and provide many examples (that is, fully worked problems) of really unusual and slick integration
techniques (which may however not be so advanced or use special
functions).

Can you point out some good references?

Related question: “Really advanced techniques of integration (definite or indefinite)”.

Remark: Clearly, an answer should add some references that have not been mentioned yet (either in the comments or in the related thread),.