Primary Sources of Classical Economics

What are the main primary sources of classical economics? What are the main treatises in classical economics? I will list some of what I can think of below.

  1. Principles of Political Economy by John Stuart Mill

  2. On the Principles of Political Economy and Taxation by David Ricardo

  3. An Inquiry Concerning the Wealth of Nations by Adam Smith

  4. Essays Moral, Political, and Literary by David Hume

Are all of those appropriate on such a list? What else is there? I know that George Reisman also mentioned John McCulloch and John Cairnes as an important part of the classical school, but I can’t find any of their work. And I also have heard people mention Thomas Malthus as an important part, but I also can’t find any of his work. Are they as important as the others? What would a list from the greatest to least in terms of importance, or influence, of the classical economists look like? What would a list from the great to least also in terms of importance, or influence, of the individual works of the classical economists look like? What would be a good order to read them, the authors or the individual works? And so on.

IIRC, George Reisman has a list of suggested readings at the end of his monolith of a book, Capitalism.