If you just need the information (not the exact PDF), lists each chapter's title. Many chapters are available as stand-alone PDFs via Academia.edu or ResearchGate (authors upload them legally). For example, search:
She realized that covered the most explosive period of Russian history—the transition from the Tsardom of Muscovy to the fall of the Romanovs.
She loved the book. It was the gold standard of scholarship, a massive tome covering the years 1689 to 1917. But it was also a brick. It took up half her backpack, and she had already strained her wrist carrying it between the library and her lectures. More importantly, she needed to search through hundreds of pages for references to "emancipation" for her thesis, and the index, while thorough, was forcing her to flip pages for hours.
"I just saved myself three days of reading," Elena whispered. "But what about the citations? Usually, scanning a footnote in a PDF is a nightmare."
Note: Always ensure you are downloading files from legitimate, authorized sources to avoid malware and to support the publishers who produce these academic resources.
Elena smiled, thinking of the dusty tome that now sat on her shelf as an honored reference, while the PDF lived on her tablet for daily work.