The Biodiversity Heritage Library (BHL) .... digitize the legacy literature of biodiversity held in their collections and to make that literature available for open access
The key word is legacy - but the reason for this is that most content publishers don't want to publish their latest $2000/year journal for free. What you deem legacy is up to you AFAIK.
BHL accepts electronic content, either already-digitized or born-digital, from U.S. based organizations through the Expanding Access to Biodiversity Literature grant project. Non-US based organizations are still encouraged to contribute electronic content, however our resources for metadata processing and content integration are limited at this time.
Google Scholar and Microsoft Academic are for the most part just indexers and crucially they include non-free content. BHL actually scans documents and hosts content [well, Archive.org does] and it doesn't not include non-free content - hence the difference in search results. For example, the Ent Record up to 2006 is available via the BHL: http://www.biodiversitylibrary.org/bibl … 8#/summary. If Ent Record wanted to they could provide every issue up to the current one to BHL. Could the Dipterists Forum not follow this example?
With regard to the Atlas it's worth noting that
Biodiversity Heritage Library uses taxonomic intelligence tools, including Global Names Recognition and Discovery (GNRD) developed by Global Names Architecture, to locate, verify, and record scientific names located within the text of each digitized page.
Neither Google Scholar nor Microsoft Academic do this AFAIK.
Charlie Barnes
Information Officer
Greater Lincolnshire Nature Partnership