When searching for primary sources on the Internet, try to think about organizations that would have an interest in keeping the materials you are searching for. For instance, Society for Historians of American Foreign Relations will have materials related to Spanish American War.
Additionally, use search terms like: digital collection, digitized, archives, finding aid, primary sources
There are many fantastic digitization projects that are going on right now that make primary source materials much more easily accessible to you.
Here are a couple of tips for looking for these to get you started on your research.
Primary sources include a variety of materials written or created during the time period of the topic you are researching.
Primary Sources Online: Finding, Evaluating, and Using from the American Library Association
Library collections include primary sources in a variety of formats. Most of those in the Hope College Libraries are in book form. In some cases, the content of the book has been transferred to microfiche or a special type of microfiche known as ultrafiche.
One method for finding books that may be considered primary sources is to search PRIMO using keywords that describe your topic in combination with the following terms:
Remember that you may need to think about your topic broadly to find primary sources using this method. After actually looking at the source you will know whether or not it effectively addresses your specific topic.
There are many primary source collections freely available online.
Try searching on national library websites of countries you are researching, or do a very broad search on your topic in combination with words/phrases like "digital archive" or "primary sources" or "digitized" or "digital collection."
jane addams digital collection
france national library digitized
Hope College is now affilliated with the Center for Research Libraries. This gives us access to a great number of important historical resources, in print, microfilm and online. These can be ordered through ILL. Start looking for materials in their online catalog. Also, you can browse for newspapers by country and by city.