Like Todd, i will also say, excellent question. I believe God designed that His word will spread, Gutenberg or no Gutenberg. For example the account in Acts 8:26-39, of Phillip and the Ethiopian. He was reading the 'book of Isaiah' when Phillip came up to the chariot. The question remains whether he had it in his possession before journeying up to Jerusalem to worship or he acquired it in Jerusalem and brought it down with him. And i believe that be representative, as in people in surrounding countries, had access to various parts of the scripture. I've also come across accounts in China similar to this. When bibles were banned, people 'survived' on pages pulled out of them. Sometimes its was a single book, say the psalms, or half of it, anything to stay 'spiritually afloat'.
Deuteronomy 6:6-9
"And these words, which I command thee this day,
shall be in thine heart: And thou shalt teach them diligently unto thy children, and shalt talk of
them when thou sittest in
thine house, and when
thou walkest by the way,
and when thou liest down, and when thou risest up. And thou shalt bind them for a sign upon thine hand, and they shall be as frontlets between thine
eyes. And thou shalt write them upon the posts of thy house, and on thy gates."