The Best Textbooks on Every Subject
For transport phenomena (momentum, mass, heat) I recommend Bird, Stewart, Lightfoot over Welty, Wicks, Wilson, Rohrer or Deen. WWWR is good if you need a quick reference and Deen is great for mathematical treatments, but nothing beats BSL if you are trying to actually learn transport phenomena.
For Physical Chemistry, McQuarrie and Simon is better than Atkins.
For basic Calculus, James Stewart has the best treatment.