I posted this in a disscusion earlier and thought it informative. Please feel free to comment, I will update, add or correct any information as time goes on.
The driving and time aside, I personally believe every landowner should have a copy of the assessors plat for land they own. You can make your trip even more worthwhile by checking to see what they have assesed you for. You can challange your assessment if you feel its too high and many times they will knock a little off just to get you out of the office. Come with a list of reasons of why you should be assessed lower, leaky plumbing, old roof, old water heater, etc....
I will speak of the caddo assessor, but most are set up in a simular manner.
To find your plat, you need to know if you are inside the city (shreveport) or out.
Depending on which one you are will determine what set of books you look in. The staff will show which ones are which. The books are by Township-Range-Section-Subdivision
For example, If you have land in section 30-T16N-13W, you are in the book that includes tract 161330.
Find the main page for your section. This will show all tracts or subdivisions in your section.
The charge for the section plat varies depending on what size you want (letter to 11x17), but is only a dollar or two.
If your land is in a subdivision, there will be a seperate page for that subdivision. The subdivision page will have the lots drawn out and maybe even have the surveyors bearings and acreage. In any case the plats are fairly presise. The same costs apply for copies.
If you get confused or can't find it, ask for help, thats why the staff is there, to help the general public.
Depending on your know how, it should only take a few minutes to find it. The staff makes the copies, usually on the spot, but it depends on how crowded it is. While your there, get the assessment info on your tract, only $0.50
If you know your s-t-r you are in good shape, if not you will need to ask, the staff can look you up by address or name.
They have computers for the general public, but they are a pain to use.