Some of the best stuff is not by veggie authors. My favourite is Jane Grigson's classic vegetable book.
Also, look at Elizabeth David. Traditional stuff, and a reminder of how good real English food can be.
The 'meat' thing can often make us forget how good and varied our food can be. Meat is a luxury, and our ancestors knew this. Our traditional foods often included days when we accepted alternatives. Good cooks just get on with preparing stuff, with what is available. The 'vegetarian' tag is not always helpful.