Major universities in the region provide structured study material (Self-Learning Material) in PDF format for undergraduate courses: Panjab University (CDOE)
Punjabi University Patiala and Panjab University Chandigarh often host academic papers and digitized versions of classic historical texts.
Type your keyword in Gurmukhi. Many volunteers have uploaded rare colonial-era books on Punjabi culture. Look for files labeled "Bhai Vir Singh Sahitya Sadan" – these are highly authoritative.