The author has extensively researched and identified the artist's drawings, notebooks, and other works on paper. English translations of the texts are provided at the end of the book. The author has studied and identified the artist's drawings, notebooks, and other works on paper that were exhibited in public, or cited in inventories established after the artist's death by his brother, and others. He also has relied upon related drawings and works (including paintings, drawings, and prints) to correlate dates. The publication also has a bibliography, which includes writings by Solana, solo and group exhibitions, and examples of the artist's signature.