Do you know these antique italian big bottles?

Pietrantica

Hi, do you know this type of bottles? How to have your appraisal? Thank you.

http://img814.imageshack.us/img814/2479/antiquebottles.jpg
http://img85.imageshack.us/img85/4461/antiquebottlen1.jpg
http://img714.imageshack.us/img714/3701/antiquebottlen1zoom.jpg
http://img204.imageshack.us/img204/4623/antiquebottlen2.jpg
http://img577.imageshack.us/img577/1289/antiquebottlen2zoom.jpg
http://img707.imageshack.us/img707/6779/antiquebottlen3.jpg
http://img811.imageshack.us/img811/9167/antiquebottlen3zoom2.jpg
http://img707.imageshack.us/img707/4607/antiquebottlen4.jpg
http://img24.imageshack.us/img24/5233/antiquebottlen4zoom.jpg
http://img341.imageshack.us/img341/4370/antiquebottlen5.jpg
http://img18.imageshack.us/img18/5164/antiquebottlen5zoom.jpg
http://img807.imageshack.us/img807/1244/antiquebottlen6.jpg
http://img194.imageshack.us/img194/3882/antiquebottle6zoom.jpg
http://img69.imageshack.us/img69/9514/antiquebottle7.jpg
http://img442.imageshack.us/img442/5467/antiquebottle7zoom.jpg
http://img860.imageshack.us/img860/7668/antiquebottlen8.jpg
http://img823.imageshack.us/img823/11/antiquebottlen8zoom.jpg
http://img839.imageshack.us/img839/918/antiquebottlen9.jpg
http://img824.imageshack.us/img824/369/antiquebottlen9zoom.jpg
http://img94.imageshack.us/img94/5112/antiquebottlen10.jpg
http://img577.imageshack.us/img577/3690/antiquebottlen10zoom2.jpg
http://img207.imageshack.us/img207/3897/antiquebigbottles.jpg
http://img545.imageshack.us/img545/3041/antiquebigbottleszoom.jpg

historic

These large bottles are known here in the US as "demijohns" and sometimes as "carboys"

There are lots of people collecting them - values range primarily in the $50-150 range but often more.