Question

which is the world's largest collection of similar materials??​

Answer 1

Answer:

The Library's Iberian, Latin American and Caribbean collections, comprising more than 10 million items (books, journals, newspapers, maps, manuscripts, photographs, posters, recordings, sheet music and other materials) are the largest and most complete in the world.

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Answer 2

The Ludlow-Santo Domingo Library is the world’s largest private collection of material on altered states of mind. The 50,000-plus-item collection documents psychoactive drugs and their physical and social effects. It covers everything from cultivation and synthesis to the myriad cultural and countercultural products such altered states of mind have inspired and influenced.