In 1988, the famed Esperanto poet William Auld produced a list of "Esperanto Classics" -- essentially the Esperanto canon as he saw it. He updated the list in 1997. The list is a great starting point for exploring original Esperanto literature.
Here's the list with links to Esperanto-USA's bookstore for titles in stock. Some of these texts are also available from other book services (like UEA's) .
Proza Fikcio / Prose Fiction
Poezio / Poetry
Darcy Ross on Local Groups
Haroldo de Esperanto on NASK
Esperanto: Learning and Using the International Language.
By David Richardson.
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beginners, next steps, and advanced readers.