@Anthony: they are (almost all) NTSC laserdiscs.

The only PAL ones are Rox et Rouky (The Fox and The Hound) - french language, never released in US as laserdisc - and Who Framed Roger Rabbit - english, which contains three short cartoons that, AFAIK, were not available anywere in laserdisc format.

@Jetrell: my daughter too loves "Nightmare Before Christmas", but the italian version - which was dubbed by Renato Zero, an italian singer who I usually hate, but I liked him very much in this movie!