Flooring slabs (vintage) (Roebuck SG2)

Small floor slabs, removed from old building 30+ years ago. Probably 50+ years old.
20 (plus a few badly chipped) measuring approx. 230 x 230mm, thickness 35mm.
29 (plus a few chipped) measuring approx. 230 x 100mm, thickness 45mm.
Might be suitable for small area of garden paving or garden feature. They have been stored in my garden for about 30 years and appear to be frost-resistant.