Handbook of Latin American studies - http://lcweb2.loc.gov/hlas/

HarpWeek - http://loc.harpweek.com/

HCI bibliography - http://hcibib.org/ - human-computer interaction resource

Health and safety science abstracts - 
http://www.csa.com/factsheets/health-safety-set-c.php

Health source-- consumer edition - 
http://www.ebscohost.com/thisTopic.php?topicID=82&marketID=1

Health source-- nursing/academic edition - 
http://ebscohost.com/thisTopic.php?topicID=83&marketID=1

HeritageQuest online - 
http://www.heritagequestonline.com/hqoweb/library/do/index 

Historic events of the 20th century - 
http://nclive.lib.ncsu.edu/authhome.phtml?rsrc=144

Historical abstracts - http://library.dialog.com/bluesheets/html/bl0039.html

History of science, technology, and medicine - 
http://www.ohiolink.edu/db/access.html

Human genome abstracts - 
http://www.csa.com/factsheets/human-genome-set-c.php

Human population & natural resource management - 
http://www.csa.com/factsheets/humanpop-set-c.php

Human protein atlas - http://www.proteinatlas.org/

Humanities & social sciences index retrospective - 
http://www.hwwilson.com/Databases/ssi_hum_retro.htm