How to append elements of two or more vectors

I am trying to create a vector with values like this

1, 2, 3, 4, 4.2, 4.4, 4.6, 4.8, 5, 6, 7, 8

In practice there will be many more values and it wouldn't be practical to enter them one at a time. If I create three vectors like this

v1 := 1,2..4

v2 = 4.2,.4...4.8

v3 = 5,6..8

Is there some way I can combine them into a single vector?

Also, I would like the resulting vector to be a row vector rather than a column vector (if that is possible).