Answer: (1) According to the different types of literature publishing, information resources can be divided into 1 books: published in chapters. Generally, it is a secondary or tertiary document rearranged by the author using the developed scientific research achievements and knowledge. The main types are: textbooks, encyclopedias, dictionaries, dictionaries, manuals, monographs, essays, conference proceedings, series, yearbooks, etc.

Sci-tech periodicals: periodicals that mainly report new theories and technologies in the field of resources and environmental science, and publish a large number of original original documents. The number of published papers is large, the speed is fast, the content is novel, it is published regularly or irregularly, and there is a fixed periodical name.

Periodicals are divided into weekly, biweekly, monthly, bimonthly, quarterly, biannual and annual.

Periodicals are divided into magazines, periodicals, briefings, briefings, express reports, abstracts, indexes and comments.

Special literature refers to non-book materials other than books and periodicals.

Types include: technical reports, government publications, conference documents, standard materials, dissertations, patent documents and product samples.

(2) According to different storage carriers, information resources can be divided into printed information resources, electronic information resources, digital information resources and multimedia information resources.

(3) Digital information resources can be divided into bibliographic digital information resources, abstracts, bibliographic digital information resources, indexed digital information resources, full-text digital information resources and multimedia information resources according to the degree of digitization and processing units.

(4) According to the content of information, it can be divided into natural information resources, biological information resources, machine information resources and social information resources.