Tracy's biography is the more complete, giving details of his earlier ships.

The time boat was little different from the earlier ship they had learned to handle.

But of course if they had taken a later ship or an earlier ship, I still would have met them here without planning it.

There were also significant machinery problems in the earliest ships.

While early ships' operators were mostly male, some women entered the field as well.

Then, when the early ships exploded due to bad design, space travel lost its support.

One of those earlier ships whose fate had been a mystery on their home world?

Despite the serious faults of the earlier ships not being apparent when these were in design, they had been resolved.

All these guns required three cannon decks to hold them, one more than any earlier ship.

Many of the early ships met with accidents and disappeared.