Inside Interesting Integrals - Paul J. Nahin (Springer, 2015)

If you want to improve your integration skills this is the book for you.  The perfect book if you are stuck at home on a snow day and you like to make calculations (I am, and I do.)  My only quibble with this book is that the author uses MATLAB to check his results.  I prefer books that teach students to determine whether the answers make sense.  I suppose that most people use numerical routines to check results these days - but keep in mind that they don't always get the right answer.  Personally, I'd prefer to use Python or R to check the results - I prefer that students know what algorithms are being used.  All in all,   a worthwhile book.