Journal Coverage |
Over 5,000 journals in the areas of medicine, nursing, dentistry, veterinary medicine, the health care system and preclinical sciences. |
Over 15,000 journals in the areas of science, technology, medicine, psychology, sociology, and economics. |
Over 8,000 journals in the areas of science, technology, medicine, psychology, sociology, and economics. |
Years of coverage |
15 million records from the mid 1950's |
28 million records from 1966 (cited references from 1996 only) |
37 million records from 1945 (note: NIH access begins in 1955) |
Type of Updates |
Subject, author, or journal Table of Contents (TOC) |
Subject, author, cited reference or Journal TOC |
Subject, author, cited reference or Journal TOC |
Update Frequency |
Daily, Weekly, or Monthly |
Daily, Weekly, or Monthly |
Weekly or Monthly |
Databases Searched |
PubMed, Nucleotide, Genome, Protein, and other NCBI databases |
Scopus includes records from MEDLINE, Embase, Compendex, and Geobase |
Web of Science includes records from Science Citation Index and Social Science Citation Index |