One of the busiest maps in terms of things to climb and jump on in Tony Hawk's Pro Skater 1 + 2 is the Mall Level, which mostly takes you downhill through a mall that then heads back to the top once you've reached the bottom.
One of the collectable objectives for the level is the Glass Cards which act as directories scattered around the mall. All you have to do is go through them, but be careful when running them as they can stifle speed and momentum. There are five of them and it's easy to miss one if you don't focus on your destination.
Here are the locations of the five glass directories in the Mall level of Tony Hawk's Pro Skater 1 + 2.
All glass directory locations in the mall in THPS 1 + 2
The first is when you enter the mall itself. You will have the option to climb a ramp to the next level or stay on the current level. Head up high, and the first one should be up there.
For the second directory, the quickest route from the first is straight ahead and goes through the fountain fault which is in the center of the mall. There are two big jumps here, and once you get through them you'll find the directory. If you miss the jump, however, you can head to the left side of the central platform to find a ramp that will take you there. Go back in the direction you came from and the glass directory will be there.
The third directory can be found just after the central element along the left sidewalk and just below where you will find the secret videotape in the level.
If you walk down the mall from here, you will find the manager in the elevated area of the slope that you will have to walk to reach.
The final repertoire you need to target is right at the end of the next area where you'll find a number of bards and quarterpipes. It is in the center of the area just before the door that leads to the exit of the mall.