The phrase "assortment of these" is correct and usable in written English.
It can be used when referring to a variety or selection of specific items or categories previously mentioned.
Example: "The store offers an assortment of these products, catering to different customer preferences."
Alternatives: "variety of these" or "selection of these".
I'll be publishing an assortment of these notes/tips.
Providing an assortment of these is crucial to the charm of any meal and tricky to achieve without meat.
On Friday and Saturday nights, and three more times thereafter, a varying assortment of these premieres will be grouped under the title "All New".
He keeps a well-pressed assortment of these dark camouflage outfits on a wardrobe rack in the alcove off his living room, alongside his infrequently used barbells and a folded-up running machine.
An assortment of these luscious mollusks may inspire wonder at the efficiency of natural selection: tiny shells deep and spiny, shells shallow and elongated, shells round and smooth -- all suited to their native waters.
To one side, a table is piled high with gold trophies as if for some strange sports day – and in one of the evening's most amusing moments, Edward impulsively presents an assortment of these to Gaveston, careless, in his infatuation, of which titles he is bestowing on his darling.
The same mutant accumulated cytoplasmic 19S-type mRNA, but the assortment of the 5' ends of these mRNAs differed from the assortment of the wild-type counterparts.
We performed these calculations assuming independent assortment of the alleles.
A modern formulation of the second law, the law of independent assortment, is that the alleles of a gene pair located on one pair of chromosomes are inherited independently of the alleles of a gene pair located on another chromosome pair and that the sex cells containing various assortments of these genes fuse at random with the sex cells produced by the other parent.
Our model does not explain assortment of rDNA given these genes are present in such high copy numbers unless these copies occur in synteny.
All of which has left an odd assortment of levees protecting these towns, even now.
