These flashcards come from the lessons in the New Practical Chinese Reader. They include simplified and traditional characters. I'm very interested in your input, including errors/typos you may find. Textbooks 1-4 are here.
These flashcards originate from the database at HSKFlashcards.com where they are available in other file formats as well. I digitized books 1, 2 and 3; Topple digitized book 4.