Linear A
Most texts seem to be lists. A few are probably short dedications, as they are found on libations. So far, no long texts have been found. Straight lines, such as those used for Linear A, are not very practical to use on clay tables. For this reasons, most writing was probably done on other things, such as papyrus or parchment. The problem with these materials is that they do not last as long as clay does. For this reason, most writing on papyrus and parchment has probably been lost.