The phrase "a collection of approximately" is correct and usable in written English.
It can be used when you want to indicate an estimated number or quantity of items in a group or collection.
Example: "The museum has a collection of approximately 500 ancient artifacts on display."
Alternatives: "a group of about" or "a set of roughly".
The items are drawn from a collection of approximately 1,200 pieces belonging to Nasser D. Khalili, a scholar and philanthropist born in Iran in 1945 and based in London.
CML has grown to have a collection of approximately 100 elements and approximately 100 attributes.
A collection of approximately 94 million documents and 1 terabyte (TB) of text is used to test the performance of the different architectures.
This screen is based on microscopic monitoring of nuclear pore complexes and nucleolar proteins fused with the green fluorescent protein in a collection of approximately 400 individual deletion mutants.
We apply SemTag to a collection of approximately 264 million web pages, and generate approximately 434 million automatically disambiguated semantic tags, published to the web as a label bureau providing metadata regarding the 434 million annotations.
This full paper presents the CADCE (Corpus of Architecture Discourse in Contemporary English), a collection of approximately 500.000 words of written language from a range of different sources designed to represent the language of Architecture in contemporary English in order to study the lexis of this particular field.
Mirouze, now 50 and a furniture manufacturer in Blois, France, has since amassed a collection of some 300 items worth approximately $500,000.
The University of Copenhagen has a unique collection of approximately 25,000 skeletons from all prehistoric and historic periods of the Danish past.
The sponges collected by divers of the Royal Dutch Navy and Van Veen grabs during this survey were not fully documented, but were retained at Naturalis, the National Museum of Natural History, Leiden the Netherlands, as a bulk collection of approximately 220 specimens.
In Canada, a world collection of approximately 3,500 accessions of cultivated flax is maintained by Plant Gene Resources of Canada (PGRC).
Also, we analysed the PBMC transcriptome with an arbitrary collection of approximately 10,000 cDNA probes [ 21].
