You're looking for information on downloading the 22nd edition of Harrison's Principles of Internal Medicine in PDF format for free, and perhaps some guidance on writing a good essay related to this topic.
The Harrison's Principles of Internal Medicine, 22nd Edition harrison 22nd edition pdf free download
: The complete, regularly updated digital version is available via AccessMedicine for those with an individual or institutional subscription (common for medical students and hospital staff). You're looking for information on downloading the 22nd