How many Rangers of the North were there ?

[Snowdog]

A lot of conjecture here and opinions and such. Michael Martinez covers a lot of the 'what ifs' and 'I thinks' in his writings on the Dunedain, and I myself have a somewhat non-canonical interpretation of them based on some RP and stories I've written over the years. But for a moment, let's look at what Tolkien wrote on the Dunedain Rangers in the various books...

Few now remember them ... yet still some go wandering, sons of forgotten kings walking in loneliness, guarding from evil things folk that are heedless. Tom Bombadil … The Fellowship of the Ring I - Fog on the Barrow-downs

Rangers - The Dúnedain of the North after the fall of the North Kingdom, secret guardians of Eriador (Unfinished Tales, index)

They came to Sarn Ford and the southernmost borders of the Shire. They found them guarded, for the Rangers barred their way.……some fled northward … Some still dared to bar the ford and held it while the day lasted. (Unfinished Tales, The Hunt for the Ring)

…the Dúnedain of the North, ……..a strange people wandering secretly in the wild, and other men knew not their homes nor the purpose of their journeys, and save in Imladris, in the House of Elrond, their ancestry was forgotten.(Silmarillion, Of the Rings of Power and the Third Age)

When the kingdom ended the Dúnedain passed into the shadows and became a secret and wandering people, and their deeds and labours were seldom sung or recorded. Little is now remembered of them since Elrond departed.... (Lord of the Rings, Appendix A)

in the wild lands beyond Bree there were mysterious wanderers. The Bree folk called them Rangers and knew nothing of their origin. They were taller and darker than the Men of Bree and were believed to have strange powers of sight and hearing, and to understand the language of beasts and birds. They roamed at will southwards and eastwards even as far as the Misty Mountains; but they were now few and rarely seen. (Lord of the Rings, At the Sign of the Prancing Pony)

Aragorn said of the land and his abilities:

There is food in the wild,’ said Strider ‘berry, root and herb; and I have some skill as a hunter at need.’ (Lord of the Rings, A Knife in the Dark)

’Rangers have been here lately. It is they who left the firewood behind.’(Lord of the Rings, A Knife in the Dark)

Halbarad said:

‘I have thirty with me.’ said Halbarad ‘That is all of our kindred that could be gathered in haste; (Lord of the Rings, The Passing of the Grey Company)

A little apart the Rangers sat, silent, in an ordered company, armed with spear and bow and sword. They were clad in cloaks of dark grey, and their hoods were cast now over helm and head. Their horses were strong and of proud bearing, but rough-haired;…….There was no gleam of stone or gold, nor any fair thing in all their gear or harness; nor did their riders bear any badge or token, save only that each cloak was pinned upon the left shoulder by a brooch of silver shaped like a rayed star. (Lord of the Rings, The Passing of the Grey Company)

If there is more written specifically about the Dunedain of the North and they being Rangers by Tolkien, I would like to know.