The phrase 'hitherto available' is correct and usable in written English.
You can use it to refer to something that was previously accessible or known, but no longer is. For example: "The hitherto available information about the ancient ruins has been rendered inaccessible by the recent road closure."
However the unilocal nature of these loci and the scarcity of parasites in chronic lesions make it necessary to use high sensitivity PCR with nested primers, whose design depends on the availability of long flanking regions, a feature not hitherto available for any known T. cruzi microsatellites.
Philological research established a more reliable chronology of the work than had been hitherto available.
However, no molecular models of substrate binding and catalysis are hitherto available for this enzyme.
However, no information is hitherto available on the ultrastructural diversity of these glands.
The whole population becomes, for the first time, entitled to the medical services hitherto available only to insured workers; the scandal of "under-doctored" areas will slowly disappear.
It thus provides a much fuller context for the German Idealist movement than has been hitherto available in any comparable form in English.
We obtained something hitherto only available to my daughters (like Hello Kitty and tolerance) as a treat if they visit the twins next door.
The letters have hitherto been available only in an expurgated form, published by Basic Books as "The Origins of Psychoanalysis," but omitting sections or whole letters that the Freud family considered too personal, unpleasant or irrelevant.
Read with the care Humez's introduction to the documentary section of her book prescribes, the collection of Tubman sources she has assembled provide the basis for a far fuller and more complex portrait than has hitherto been available.
Service providers and businesses need access to long-haul network infrastructure and connectivity to the outside world, which have hitherto been available only from Telkom and at high prices.
