ABC-CLIO
World History: the Modern Era - Several of your explorers can be found on this Research List.
Britannica - search the granddaddy of "old school" encyclopedias.
JSTOR - full texts of scholarly articles.
Science Resource Center - science articles and images from a variety of sources (reference to newspaper).
Student Resource Center Gold - articles and images from a variety of sources (reference to newspaper).
World History - articles from a variety of sources. Many of your explorers are represented here.
BBC History - for an article on Drebble.
Mariner.org - a very highly regarded website with links to explorers and their expeditions.
NOAA Ocean Explorer - Timeline of events in NOAA history.
University of Wisconsin - Underwater Exploration Timeline
Woods Hole Oceanographic Institution - James Cook Online Exhibit.
Noodlebib - to help you with your APA references page
Turnitin.com - to help prevent plagiarism