: Fundamentals, air-refrigeration cycles (including aircraft refrigeration), vapor compression systems (simple and multi-stage), vapor absorption systems, steam jet refrigeration, and cryogenics.

: Digital versions for rental or purchase are often available through the Google Play Store Amazon Kindle Physical Copies

While the desire to access educational material for free is understandable, it's crucial to consider the legal and safety implications. Exploring official channels or platforms that offer free or low-cost educational resources can be a good alternative.

Free PDFs are often poorly scanned, missing pages, or containing incorrect data—which is particularly dangerous in engineering where precise formulas and tables are required.