What is the fine-grained topic of the following text: An Orosipon kan Bikolnon reads selected fiction and nonfiction from the periodicals Sanghiran nin Bikol, An Parabareta, Bikolnon, and Bikolana published in the first half of the twentieth century in Bikol, a region in the Philippines. Only return the topic.
Selected fiction and nonfiction from 20th century Bikol periodicals