The Safety Representatives Resource Book, published by the HSA arising from an initiative by Congress, has extensive information on hazards in the workplace. Section 6 of the book has 17 chapters giving important information on subjects including bullying, occupational diseases, chemicals and hazardous substances and many more.
In addition, the Health & Safety Authority has an excellent and authoritative site which gives key information on a wide variety of topics at Health & Safety Topics
The HSA also lists information by sector at Your Industry
There are a number of short online courses available from HSA Learning including
The OSH Wiki pages also have a range of good articles on various topics.
The ETUI site also has a good thematic structure with pages dealing with