Realizing that several months have passed since your posted query, I am not sure whether or not you still need this information. However, I am posting a response with an eye toward others that may need directions to the cemetery.
To visit Andrus Cove Cemetery head south out of Jennings - toward Lake Arthur - on SH26.The precise distance escapes me, but one will cross over the intersection of SH102. Less than two kilometers further along will be a road to the left named Andrus Cove Cemetery Road. Simply follow this road - it will switch directions two or three times before straightening out for a significant distance. The cemetery is on the left about 150 meters down this leg - you cannot miss it.
The precise coordinates are:
30.079831, -92.677428 (NAD83)
To my knowledge, there is no survey of this cemetery that has been posted to the 'Net. I am also not aware of a published book, but there may be records in some repository at the local level.
If you are connected to any of the cited surnames from this cemetery, then I would welcome the opportunity to correspond.