The two Crystal books can be read at any point, they are completely stand alone. Balance of Trade was stand alone, but now has a direct sequel, Trade Secrets. Since all four of the books are chronologically well before the main storyline, you can treat them completely independently. But I do think that once you circle back to pick up the early books, reading the two Crystal books before the two Trade books makes sense. OTOH, I don't recommend reading the Crystal books as your first Liaden books, even though they are chronologically first. The two Trade books, however, could be a good entry point.
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