"Our mission, is to publish books on social and cultural issues, including books on law related to those areas. We are not looking for books on, say, tax policy, etc"

This quote by Thomas Spence is referring to the mission of a publishing business. The objective is to release books on social and cultural problems, as well as books on law related to those areas. This implies that the publishing company is looking for books that focus on subjects such as gender, race, and other social concerns, along with books that talk about the legal implications of those subjects. The quote likewise implies that the publishing business is not looking for books on topics such as tax policy, which would be beyond the scope of their objective. This quote is a pointer that the publishing business is concentrated on particular topics and is not trying to find books on other subjects.