miscellaneous writings; writings on various topics
Refers to a collection of writings covering many different subjects, often by a single author. Compare 雑書, which can also mean 'miscellaneous books'.
See also: 雑書
A collection of his miscellaneous writings was published posthumously.
unclassifiable book; book that defies categorization
Used for a book that does not fit neatly into any standard genre or library classification. This sense is less common than sense 1.
In the library, this book is treated as an unclassifiable work.